Zonal trabecula femoral condylar component containing zirconium-niobium alloy on oxidation layer and preparation method thereof

A preparation method of a femoral condylar component containing zirconium-niobium alloy with an oxidation layer comprising includes the following steps:

• 1) using zirconium-niobium alloy powder as a raw material, conducting a 3D printing for one-piece molding, and obtaining a first intermediate product of the femoral condylar component containing zirconium-niobium alloy with the oxidation layer, putting the first intermediate product into a Sinter-HIP furnace, heating to 1250° C.-1400° C. under inert gas protection, and placing at a constant pressure of 140 MPa-180 MPa for 1 h to 3 h, and reducing to an atmospheric pressure, cooling the furnace to below 200° C. with putting the first intermediate product into the furnace, taking the first intermediate product out, and obtaining a second intermediate product;
• 2) putting the second intermediate product into a programmed thermostat, cooling to −80° C. to −120° C. at a rate of 1° C./min, keeping it at a constant temperature of −80° C. to −120° C. for 5 h to 10 h, and taking the second intermediate product out of the programmed thermostat;
• and
• putting it into a liquid nitrogen for 16 h to 36 h, and adjusting the temperature to a room temperature so as to obtain a third intermediate product;
• 3) putting the third intermediate product in a programmed thermostat, cooling to −80° C. to −120° C. at a rate of 1° C./min, and placing the third intermediate product at a constant temperature of 80° C. to −120° C. for 5 h to 10 h, taking the third intermediate product out of the programmed thermostat, and putting the third intermediate product into the liquid nitrogen for 16 h to 36 h, and adjusting the temperature to the room temperature so as to obtain a fourth intermediate product;
• 4) machining, finishing, polishing, cleaning, and drying the fourth intermediate product, and obtaining a fifth intermediate product, where an articular surface roughness of the fifth intermediate product is Ra≤0.050 μm;
• 5) putting the fifth intermediate product into a tube furnace, introducing an atmospheric pressure inert gas containing 5% to 15% of oxygen in percentage by mass, heating to 500° C. to 700° C. at 5° C./min to 20° C./min, and cooling to 400° C. to 495° C. at 0.4° C./min to 0.9° C./min, and cooling to be below 200° C. sequentially, taking the fifth intermediate product out to obtain the femoral condylar component containing zirconium-niobium alloy with the oxidation layer;
• and the inert gas is helium or argon;
• a structure of the femoral condylar component containing zirconium-niobium alloy with the oxidation layer includes a medial condyle (11), and a lateral condyle (12);
• a medial condyle anterior end (1101) of the medial condyle (11) is integrated with a lateral condyle anterior end (1102) of the lateral condyle (12);
• a posterior end of the medial condyle (11) is connected with a posterior end of the lateral condyle (12) by a stopper (15);
• a lateral wall of the medial condyle (11) and a lateral wall of the lateral condyle (12) are both provided with a holding slot (16);
• the medial condyle (11) is provided with a medial condyle fixation surface (110);
• the lateral condyle is provided with a lateral condyle fixation surface (120);
• the medial condyle fixation surface (110) includes a first fixation surface (111), a second fixation surface (112), a third fixation surfaces (113), a fourth fixation surface (114) and a fifth fixation surface (115) which are connected sequentially;
• the lateral condyle fixation surface (120) includes a sixth fixation surface (121), a seventh fixation surface (122), an eighth fixation surface (123), a ninth fixation surface (124), and a tenth fixing surface (125) which are connected sequentially;
• a mounting hole (17) is formed in the middle of the third fixation surface (113) and the eighth fixation surface (123);
• the first fixation surface (111) is intersected with the second fixation surface (112) to form a first intersecting line (181);
• the second fixation surface (112) is intersected with the third fixation surface (113) to form a second intersecting line (182);
• the third fixation surface (113) is intersected with the fourth fixation surface (114) to form a third intersecting line (183);
• the fourth fixation surface (114) is intersected with the fifth fixation surface (115) to form a fourth intersecting line (184);
• an intersecting line of the sixth fixation surface (121) and the seventh fixation surface (122) is collinear with the first intersecting line (181);
• an intersecting line of the seventh fixation surface (122) and the eighth fixation surface (123) is collinear with the second intersecting line (182);
• an intersecting line of the eighth fixation surface (123) and the ninth fixation surface (124) is collinear with the third intersecting line (183);
• an intersecting line of the ninth fixation surface (124) and the tenth fixation surface (125) is collinear with the fourth intersecting line (184);
• and
• the first Intersecting line (181), the second intersecting line (182), the third intersecting line (183), and fourth intersecting line (184) are parallel to each other;
• an included angle between the first fixation surface (111) and the second fixation surface (112) is 130° to 140°, equal to an included angle between the sixth fixation surface (121) and the seventh fixation surface (122);
• an included angle between the second fixation surface (112) and the third fixation surface (113) is 130° to 140°, equal to the included angle between the seventh fixation surface (122) and the eighth fixation surface (123);
• an included angle between the third fixation surface (113) and the fourth fixation surface (114) is 130° to 140°, equal to the included angle between the eighth fixation surface (123) and the ninth fixation surface (124);
• an included angle between the fourth fixation surface (114) and the fifth fixation surface (115) is 130° to 140°, equal to the included angle between the ninth fixation surface (124) and the tenth fixation surface (125);
• the first fixation surface (111), the fifth fixation surface (115), the sixth fixation surface (121) and the tenth fixation surface (125) are provided with a first bone trabecula (191);
• the second fixation surface (112), the fourth fixation surface (114), the seventh fixation surface (122) and the ninth fixation surface (124) are provided with a second bone trabecula (192);
• the third fixation surface (113) and the eighth fixation surface (123) are provided with a third bone trabecula (193);
• a pore diameter and porosity of the first bone trabecula (191) are smaller than those of the second bone trabecula (192) and the third bone trabecula (193) in sequence.